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# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to# newer versions of the distribution.deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricteddeb-src http://us.archive.ubuntu.com/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the## distribution.deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricteddeb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu## security team.deb http://us.archive.ubuntu.com/ubuntu/ trusty multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ trusty multiversedeb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse

## N.B. software from this repository may not have been tested as## extensively as that contained in the main release, although it includes## newer versions of some applications which may provide useful features.## Also, please note that software in backports WILL NOT receive any review## or updates from the Ubuntu security team.deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's## 'partner' repository.## This software is not part of Ubuntu, but is offered by Canonical and the## respective vendors as a service to Ubuntu users.# deb http://archive.canonical.com/ubuntu trusty partner# deb-src http://archive.canonical.com/ubuntu trusty partner

## This software is not part of Ubuntu, but is offered by third-party## developers who want to ship their latest software.deb http://extras.ubuntu.com/ubuntu trusty maindeb-src http://extras.ubuntu.com/ubuntu trusty main

My best guess is that 4.3 is built on an Ubuntu Version that no longer has support.

And now, the completely true facts, as told by an anonymous man hiding behind a screen name:

## Major bug fix updates produced after the final release of the## distribution.deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricteddeb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu## security team.deb cdrom:\[Ultimate_Edition.*4.2. trusty multiversedeb-src cdrom:\[Ultimate_Edition.*4.2. trusty multiversedeb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse

## N.B. software from this repository may not have been tested as## extensively as that contained in the main release, although it includes## newer versions of some applications which may provide useful features.## Also, please note that software in backports WILL NOT receive any review## or updates from the Ubuntu security team.deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's## 'partner' repository.## This software is not part of Ubuntu, but is offered by Canonical and the## respective vendors as a service to Ubuntu users.deb http://archive.canonical.com/ubuntu trusty partner# deb-src http://archive.canonical.com/ubuntu trusty partner

and navigate to sources and open with an editor, to comment out, insert a # at the beginning of the line and save. Then after run update and see if it catches.

To be honest I was having massive issues with these repositories myself and gave up I think, but this was more related to my internet connection and running keysnatcher while I was having connection issues.

You could also try running keysnatcher and see if that clears it up.

And now, the completely true facts, as told by an anonymous man hiding behind a screen name: